23173729 has 4 divisors (see below), whose sum is σ = 23800084. Its totient is φ = 22547376.

The previous prime is 23173723. The next prime is 23173751. The reversal of 23173729 is 92737132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9778129 + 13395600 = 3127^2 + 3660^2 .

It is a cyclic number.

It is not a de Polignac number, because 23173729 - 2¹³ = 23165537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23173694 and 23173703.

It is not an unprimeable number, because it can be changed into a prime (23173723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313122 + ... + 313195.

It is an arithmetic number, because the mean of its divisors is an integer number (5950021).

Almost surely, 2^23173729 is an apocalyptic number.

It is an amenable number.

23173729 is a deficient number, since it is larger than the sum of its proper divisors (626355).

23173729 is an equidigital number, since it uses as much as digits as its factorization.

23173729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626354.

The product of its digits is 15876, while the sum is 34.

The square root of 23173729 is about 4813.9099493032. The cubic root of 23173729 is about 285.1009348040.

The spelling of 23173729 in words is "twenty-three million, one hundred seventy-three thousand, seven hundred twenty-nine".